So a reverse image search has showed that this has been around for a while, mostly with a play on the Eminem song ‘Lose Yourself’ lyrics (moms spaghetti). Also the picture is a little bigger and you can see his feet. The high chair is a ‘low’ chair that presumably he has kicked with his feet against the floor and gone over backwards. (My brother had a similar one in the 90’s).
So I would like to think it was accidental rather than deliberate. But regardless, the child is clearly distressed, frightened, shocked and may be hurt. My first reaction would be to scoop him up and give him a cuddle, not take a photo and then let it go viral so the whole world can see what your priorities are as a parent.