One thing I've noticed is that people seem to get angry very quickly. Something as simple as stating, "I [don't] prefer ASI." and providing an explanation behind why will make some people angry. You don't even have to say "Those who don't agree with me about ASI are wrong!" for people to be angry that you have the temerity to give voice to your different preference. It sometimes feels as though we're locked in some sort of culture war.
The corollary to this is the "Why don't you ..." any time people disagree. DMs and players make decisions all the time. But if we're talking about some option X that I could implement there's always someone that says "But you could have option X". Yes. I know. I could, I don't. I explained why I don't and I'm not trying to convince anyone else that my option is any better. We're just having a conversation and discussing pros and cons. I'm not even really trying to convince the handful of people that are posting opposing alternatives, I'm just letting all those lurkers out there know what I do and if they feel like it will work for them that it's okay. There's a lot of flexibility with the game and it's not going to break if one group is different than others. I think it's a feature, not a bug.