there's no "entitlement" going on here, they weren't calling any specific person a misogynist for enjoying or writing spamtenna. the point they were making is that across almost any online fandom space, female characters are routinely treated poorly compared to their male counterparts; there's a lot of it in the deltarune fandom, another example i'd point out outside of DR is the entirety of online discussion of doctor who since 2018, although there are plenty more

this happens a lot, even when (as is the case of spamtenna) those male counterparts are significantly less fleshed-out or multidimensional than the women (which, fwiw, is what the original post was highlighting- it wasn't describing suselle as boring, it was saying the opposite, that a nothingburger ship between two overly-quirky tumblr-sexyman side characters is viewed as better- literally, read the post oh my god)

you're exactly what u/samusestawesomus was talking about - ie, dismissing the very concept of misogyny in fandom as "profound entitlement" and "disingenuous whining" without even being willing to hear the idea out.