Willow doesn't get as much hate as Xander, but there are definitely a sizeable number of fans today who really hate the scoobies, and are always talking about what terrible friends they were to Buffy. In general the side characters like Tara, Anya, Cordelia etc get a lot more fandom love from what I've seen

I always liked Xander's friendship with Willow, it was a shame that it got dropped a bit in the college years in favour of Buffy and Willow's friendship, although they did still get some nice scenes together from time to time.

And I used to be a big shipper of Xander/Cordelia when I was younger, it was a shame how abruptly it all ended, I thought they worked well together. Xander/Anya were fine, but I never felt like they had the same chemistry