The press has always, under every administration, asked questions unrelated to the event at these availabilities.
Add to that the fact that Trump has a history of responding to these unrelated questions and it's hard to argue the pool reporter was out of line.
The press has countless platforms and venues from which to launch their smears and slander against the POTUS, totally protected by the 1st amendment and under the umbrella of a free press.
There is no reason why the POTUS needs to invite them into his home to do it. Yes, the White House is more than a private home, but it is a home nonetheless and as such it should afford the President and his family a minimum of respect and decency from those invited to enter, and a respite from vile and hateful taunts and smears.
I think the entire press core should all be kicked out of the White House. A camera feed for publicized events would be more than sufficient fir the public to enjoy access to ceremonies, announcements, etc. but there is absolutely under no obligation to invite agreeing frenzy of rhetorical “questions” and or to accommodate a permanent tent city on the White House lawn teeming with rude advocates for the adversarial Left.
It’s not a question of free press or public access - there is plenty of that elsewhere.