What do you gain from treating them with disrespect, other than escalation? Nobody likes being disrespected, regardless of whether or not they deserve / have earned that respect. By operating on a baseline of “give people the benefit of the doubt and treat them with respect by default” you open a world of constructive / logical discussion that would be closed if you were emotional.
To me, mocking someone is a person’s way of saying “I don’t have a well thought out argument against X, so I’ll just give it a nickname and talk shit about it”.
If you have to think of one person who is famous for mocking anyone / anything they don’t like, who would it be? For me, the first person that comes to mind is Trump. Is that someone who is worth modelling your behaviour after?