Crown
¯\_(ツ)_/¯
I've had a few of those comments before, I usually just ignore them or just delete them. It is really rude, I see it like if someone's setup an event and them someone goes on a speakerphone telling everyone to ditch it and go to his better one, just as it'd be rude if that were to happen, this is rude.
Exactly his comment is like going into someone's restaurant and saying nice food but the food is way nicer at my restaurant across the street.