Because he has a nasty, bitter personality and boosts his self esteem by pouncing on an honest mistake to make himself feel better? Just a guess.
Your guess is wrong. Try again. I explained it - but I will for you: EEE is typical here in that he thinks he knows everything all the time and makes declarative statements when he has no facts to back it up - and sometimes people who shoot their mouth off need to be put in their place so they learn not to do it. And for the other person’s post - he did “think” it might be false - he SAID it WAS false...and maybe this isn’t the first time this has happened. JUST A GUESS.