Harassing people shouldn't be okay at all lol, but I don't agree with anti-parse arguments ignoring that the first issue shouldn't be something allowed at all.
The issue with parsers is already said and done, people already use them SE already has done everything but install it for you, by not allowing them you make the issue worse. People can't talk to you in a constructive and concise way without fear of getting their account punished meanwhile those who would have been rude to you will have been rude to you anyways, and you wouldn't even have a specific reason why they were rude either because again the account issue.
Not allowing parsers is like wearing shoddy glasses and calling the issue gone, just because the smoke and all the other details are blurry doesn't mean those issues disappeared. We have the issue, it's not going anywhere, at least we could equip everyone with glasses now. I also believe that the anti-parsing arguments help SE to push back the mods they said we'd see ages ago, and while DBM did make the hardest content harder normal content is still fine (they could also not allow that type of mod if they want, but the most popular parser can already do "most" of DBM if someone takes the time to set it up).
Parser damage is already done, we've got the website, the groups kicking you for parse damage, the shame, all the fun, it's time to gain the advantage that parser absolutely do offer (and side features of a popular parse players use and show how to use on youtube, and SE has allowed, are not even parse features and they can help too). They will make it significantly easier to improve, as well again I believe that anti-parsing is part of SE's defense to not adding mods to the game.. and there are a lot of extra UI features I'd love to see (so many awesome WoW mods).
So I'd like to stop having all the fire but none of the coal, and I'd like to push for mods (although again maybe they make a stance on DBM earlier, it probably won't do much to normal content like WoW but it could easily mess with savage).