The problem with Dixie Kong was that she wasn't REALLY requested until Tropical Freeze came out. She was considered more dead than K. Rool before then. A lot of fans, K. Rool fans included, jumped on the Dixie bandwagon after K. Rool was disconfirmed for Smash For. Dixie wasn't considered "super important" until VERY recently. K. Rool, ever since Diddy Kong, was always the top DK fan pick. Dixie got second place because of her inclusion in Tropical Freeze. Even then, there's quite a few DK fans that want Cranky more so than Dixie.
The K. Rool fans not crossing over is a pretty big blow, I mean really. But the same could be same for Sylux. After Ridley's disconfirmation Sylux's popularity got quite the boost but it was because Ridley wasn't getting in. I think the same thing happened with Dixie and I don't think ****ting on the K. Rool fanbase is really deserving. The Dixie fanbase had a lot of crossover with the K. Rool fanbase and most of them cared more about K. Rool than Dixie. And that's all there really is to it. DK fans got their most wanted, and they're grateful. I don't understand why that's necessarily a sin.
As a Fire Emblem fan, I have to say that liking a
series does not default to liking a
character. Or a roster pick. I love FE, and I love that it's gotten so much representation, but I was
so not on board with adding Chrom. He only furthered the notion that there are too many FE characters, too many swordsmen, and too much Awakening. I'm happy for the people who wanted him in, and I'll likely play as him because I really enjoy Roy's moveset in comparison to Marth's, but I was definitely not on team Chrom before his reveal.
I can't speak for anyone who doesn't want Dixie, or doesn't want K. Rool, or anyone else, but it's certainly okay to like a series and not a character. Doesn't excuse harboring animosity toward fans with different opinions, though.