A lot of Jewish people will say that pigs are stupid and dirty animals. That is probably because they are not Kosher. That is very sad :(.
We are not permitted to deride the appearance of a pig even if it is not kosher.
I think it's because הוא is referring to the חזיר which is masculine.
The thing that kills this course is being forced to say things which one does not wish to say. It is difficult to opt out because they keep repeating it if you do so.
Well. You have to understand you casual opponents. So take it as an opportunity to prepare future argumentation.