You're a peasant in Average Fantasy World Civilization. You don't venture out of your town/city. You work hard and make very little. In this world, you know monsters exist, you know that people can vaporize you where you stand. You know that certain crazy individuals make a living giong out and poking big scary things in the nose purely to get the money these monsters hoard from eating people like you.
Then you see a group of guys armed to the teeth with shiny, dangerous looking weapons, one or more looking like every stereotype you've ever heard about "Point at you and vaporize you" guys. One of them looks like a monster itself, it's definitely Strange, and is also carrying weapons, also swaggering next to these guys. With them is some sort of wild animal...
IMC, you start shouting "Sellswords are coming! Sellswords are coming!", alarm bells start ringing, the gates of the city are closed, the city watch comes out, the local lord calls out the militia, important citizens of the city prepare for battle. Women hide their children in the basement. Soon, every window in the city has a crossbow pointed out if. Cities that wait to see whether people who look like sterotypical "Point at you and vaporize you" guys are going to start some sort of violence generally don't last long. My assumption is that the very fact that the city still exists proves it has the capacity to defend itself from things that are reasonably common in the campaign world.
Are you, honestly, going to walk up and say "HAY GET THAT ANIMAL OUT OF HERE"?
Well, maybe. It depends on how confident you are that the lords of your city are terrifying to law breakers. It depends on how confident you are that no one would dare mess with a citizen of your city for fear of the Prince and his men. If you are the fantasy equivalent of a Roman citizen, you might say, "Get that bloody flea bag out of my bar or I'll see you and your whole family are nailed to a tree... and wipe your feet before you come in the door!"
Same with any shopkeep. If you turn these guys away, you probably would think they would obliterate you, or maybe just utterly destroy your store and take what they want. But they're being nice enough to actually pay you. Are YOU going to refuse to serve them cuz they are clearly very scary?
Depends on the shopkeep. Some shopkeeps specialize in scary clientel. Some specialize in respectable clientel. Can be potentially dangerous for the wrong sort to patronize the wrong shop, because you are putting a damper on their business. "We don't serve your sort here.", is usually because "You scare away my regulars."
Notice how in every Western you've ever seen, any time a honest-to-god Gunslinger or Outlaw walks into a saloon, folks stop drinking and watch him very carefully. The Sheriff just makes a point of sitting there, his Star presented, and just Watching the Gunslinger/Outlaw to see if he'll start something. Same idea. Just replace Gunslinger with Adventurer and/or Monstrous PC Race/Ranger with Animal.
I'm a little more grim and gritty. Instead of modeling movie Westerns, I'm modeling (more or less) real Westerns. So what happens is that if you go into a respectable town as a gunslinging cowpoke, they ask you to give up your guns, and if you don't, you end up in a gunfight with every respectable citizen in town, starting with the sheriff. (For an actual example of the 'giving up the guns model', see Wild Bill Hickock vs. John Wesley Hardin. For an example of the 'Gunfight with every respectable citizen in town', see the Northfield Minnisota raid.) Now granted, if you go 'riding hell for leather into a village' as high level PC's, you'll probably be able to kill pretty much anyone who resists, but under that model you then become a national menace and while your reputation as a 'notorious bandit' might then let you walk into the bar while the barkeep cowers and remains silent you'll soon find you have other problems. Without first murdering a village, you don't have that level of reputation protection except in a city ruled by bandits where the forces of law (or good) provide no expectation of shelter to the citizens. But in that case, most remaining businesses are the 'caters to the unsavory' sort, and if the guy behind the bar objects, its probably not the case that he's a 3rd level commoner.