If a Proggie calls him Nominee Trump, respond by calling him President Trump. If they correct you by pointing out that he is just the P-E, then you win. If they remind you that Obama is still President, just tell them that he was never really President.
No matter what, you get to trigger the poor little snowflake.
Even Josh Ernest is doing it during the White House press briefings.
“Trigger” them? How about a good old fashioned throat punch?