That's not what this comic is about, although I can kind of see why you thought that.
Instead of just downvoting you, shakes head at fellow lemmings, I'll explain what sealioning is.
"Sealioning is a type of trolling or harassment that consists of pursuing people with relentless requests for evidence, often tangential or previously addressed, while maintaining a pretense of civility and sincerity, and feigning ignorance of the subject matter." - Wikipedia
The problem is the first frame. The woman says she doesn't think a whole group shouldn't exist. You can't say that and expect a person from that group to ask why she thinks he should be dead... Replace the sealion with any minority group and you'll see what I'm talking about.
Replace what she said with "trans women are women" or something progressive and I would be 100% on board with the comic. At best the comic is executed badly, at worst it's an exercise in making anti-racists look bad.
At best the comic is executed badly, at worst it’s an exercise in making anti-racists look bad.
How about making sea-lioning look bad. Because, you know, that's what the comic says, straight-out, in the first panel: It's anti sea-lion.
Doesn't matter whether it's a Jewish or Nazi or black or white or disabled sea-lion, it's a sea-lion and they suck (solely or in addition to other reasons) because they're sea-lions. Fuck sea-lions.
It sounds like what you're saying is that you only think it's only bad for someone to sealion if you personally agree with the original sentiment, which is kind of missing the point.
Sealioning is always bad and it is a terrible debating style.
It's about arguing in good faith, what ever the position and not just shutting down the debate via the text/verbal equivalent of a DDOS attack, simply overloading a target with questions via an insincere pretence of ignorance.
You see, the comic is meant to be ironic. The character says they don't like sealions, then a sealion (which is a visual metaphor for the concept of sealioning) shows up and is increasingly unbearable for the next five panels despite maintaining a pretense of civility.