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Gnolls? Evil demonspawn that can't stop eating people.
Owlbears? Violent and untameable.
Dragons? Greedy assholes that think they're better than you.
Various slimes? Will dissolve you. Can't even keep them as pets.
These silly glooby eye monsters?
Literally the most racist fuckers alive.
Wizards of the Coast please hire me to make your game better. OK that's all.
Only if you/your DM is a coward.
And the rules are more guidelines anyway, it's boring when the party just comes across another group of generically evil monsters that they just fight and there's nothing else, you might as well play a video game if you want things to be that limiting.