For me:
Naturalistic fallacy is a favourite. When people confuse what "is" with what "ought" to be, we get into all kinds of messy and hilarious forms of ahistorical and nature-ignorant error.
(But I also like "inflation of conflict", when people treat the existence of debate within a field as a sign that no truth can be found within it. Nah, bruv.)
And I can be super susceptible to black-and-white thinking when it comes to my own options and life path. Working on it!