Yeah, I can't help but feel that the message of this comic would be turned on it's head if you'd replace the sea lion with a Jew, black, Palestinian, gay, trans, etc....
I think an important part is that the sea lion is pretending to be civil while still being extremely annoying. It's adjacent to the whole thing of saying vile things with civil language (then getting upset when people respond uncivilly).
Yeah I interpreted the meme as them being sealion-phobic. The sealion was therefore rightfully offended and wanted to debate. However, the sea lion should've gone away after the 4th panel and not broke into the guys house.
Source: I am trans and would not break into a mildly annoying persons house harrasing them for a source.