> Could being attacked on twitter by the president for something you say not be construed as a very real retaliation by the administration and thus a curtailment of free speech?

No, someone talking to you in a public forum, even in a hostile fashion, is not a curtailment of free speech. It’s just free speech.

Free speech isn’t the right to not have your feelings hurt.

If Trump attacking people worked on Twitter, there wouldn’t be any democrats left in office at this point.