As long as they/posts are real, they should be OK. There will always be critics. Their (critics) posts will only hurt at the ones they are directed to if they are real. Some people are good at spotting shills, or the ones that have hidden agendas and are trying to ruin an SP or MPA. Sometimes we ignore, sometimes we comment on them, and sometimes we discect every little post they made in the past, try to link them to other handles and attack full on risking banning ourselves if we think they are being unfair to an SP/MPA, particular the ones we connections, and/or if it is a matter of principle. If you can't handle the burn don't paly with fire, particularly the backfire.
Respect is always needed in a place like this, although sometimes we joke a lot, but if we take it too far its important to apologize as well and maintain the respect.
BTW, am just joking timbit with my post above
