Enevhar Aldarion
Hero
I don't think I'd be comfortable playing at a table that was hostile to homebrew or 3pp.
My second 5e character was a minotaur in Dragonlance that was homebrewed by the DM. I'm always giving something a tweak when I DM.
I'd also say that homebrewing is hard to avoid in D&D. The nature of the game means that you're ALWAYS making DMing calls: If you've ever had to make a ruling on stealth, on the interaction of spells, if you've ever made your own adventure, if you've ever determined if something was possible...you're home-brewing. In a small, local way, but the difference between populating a dungeon and using a DMs Guild race (forex) is more one of degree than of kind.
House-ruling something and home-brewing are not the same thing. Making a ruling on how something works or adjusting a rule so that it better fits your group's playstyle is a house-rule. Creating your own world or race or class is home-brew.