That is standard gameplay. Say "Caflix teach xYA" and then ask a Catholic to prove that they don't.
At no point does the accuser say what they themselves believe, at no point does that matter.
After going around in a circle for a long time, finally it is proved to the accuser that this was wrong. But the accuser does not admit to this and jumps to another topic
Par for the course.
the circle continues and then a few weeks later, the same initial question is repeated.... sigh...
Then you correctly point out that As a subset of this perversion of discourse there is the tactic of weighing in with a massive attack on ONE aspect of our Eucharistic thought and piety. And when we have brought all our troops over to meet this assault, then we are told that we think nothing of the many other aspects of the Mass. Thatis, of course, false
You forget that others think that as long as we bow down to them, we are nice, otherwise we are rude for not agreeing with their own personal interpretation -- you even have some who say quoting from the Bible is copy-pasting
Teaching on the Eucharist has been an issue ‘within’ the catholic church, both in the past to this day, so it is no surprise those who are not catholic would also find issue with how some within the catholic church view the Eucharist.