answagonist

Someone who belittles, or rejects entirely, the swagger of another, thus standing at odds with them. The opposite of a proswagonist.

related forms -
answagonize (verb)
answagonistic (adjective)

"- So there I am having sick round after sick round, and then he shows up, acts like my swagger isn't on another level, and starts thinking of ways I should be playing better.

- That's ridiculous. Why does Rob insist on being such an answagonist?

- I have no idea."