You are using blowjobs to denigrate a person

Only in the sense of giving pleasure to someone who deserves none AKA caping for a dictator.

I already explained this, so please put away your preconceived notions that expressions can only be interpreted in the way you say they should.

contributing to a long history of homophobia in regard to hierarchical roles of people who give oral or receive anal as subservient lesser people.

Only in the case of people like yourself who can't divorce meaning from metaphor.

It is 100% homophobic to use sucking dick as an insult

Nope. Stop repeating your false preconception and READ my explanation from before ffs!

there is no positive connotation behind your comment.

Again, giving pleasure or advantage to those who don't deserve it is a negative thing. Context matters.

the goal was to shame someone for it.

No, the goal was clearly to shame someone for glorifying the war crimes of a fascist dictator.

I already explained that I don't consider oral sex between consenting adults in any way shameful regardless of whether you're receiving or giving.

Read the original comment and my clarification again. The intention and context is 100% free from homophobia, just like I wouldn't be shaming sartorial choices if I had chosen the milder "caping for Putin".