I used to frequent a site that I have abandoned because it turned into the posters on the left shutting down any opinions from the right with these sorts of accusations. If they didn't accuse you of "sealioning" it was "gaslighting" or "whataboutism". When they got challenged on their intolerance, they would counter with "the paradox of tolerence"; which basically says it's okay for so-called tolerant people to squelch what they define as intolerance.
It is complete bullshit.
I used to frequent a site that I have abandoned because it turned into the posters on the left shutting down any opinions from the right with these sorts of accusations. If they didn't accuse you of "sealioning" it was "gaslighting" or "whataboutism". When they got challenged on their intolerance, they would counter with "the paradox of tolerence"; which basically says it's okay for so-called tolerant people to squelch what they define as intolerance.
The only time I see "whataboutism" used by the left is to shut down anyone calling out their blatant double standards.