It's not just taking a stand. I may not be clear enough. There are 2 benefits in my eyes in defederating:

• Prevent fake news flood that you will never be able to counter (Brandolini's law).
• Keep this a safe space for minorities (I'm sure we have some on this instance). They don't have to read random crap about how they should not exist or other offensive comments, and they should be able to post about who they are without fear of getting targeted.

Time has proven again and again that tolerating the intolerants turns the place into an intolerant one.

As for how they'll take it: I don't have the slightest beginning of hope that exchanging with them here would have any impact on their world's vision. You don't convince cultists with rational discussions on Internet. So let them think they "proved their point". I don't care.

Edit: And of course, being MAGA is not who you are, but what you decide to be through your actions, for example registering to an openly fascist instance.