We can't assume his Twitter account was hacked.
We can assume he craves attention and is a distraction.
'The Deplorables' is a label worn with passion and pride. It's actually not an insult anymore because it has the reverse effect.
David Hogg's "meme war" plan is going to backfire: His recent profile picture change to a meme of himself in that pussy hat with "Snowflakes" label does not have the same effect.
Related PIC from: https://en.wikipedia.org/wiki/Self-abasement