How smart do I have to be to understand philosophy/philosophical theories of different philosophers?
tell me
>>3383570
Not at all because most of them are literally just "my opinion is right."
2 things you need to understand in order to actually engage in philosophical discourse.
1) Propositional logic and the mechanisms of formalizing ideas.
2) The fact that axioms are often arbitrary and most things cannot be logically justified. You're under no obligation to agree with someone else's values, therefore even if their logic is sound it's still possible to disagree with them without either of you being wrong because many axioms are based on subjective value judgements.
Basically study logic and set theory a little and then don't be an autist about your views.