DHC just isn't likely to ever get a lot of fans cheering for him or even caring about him much one way or the other in The UFC because of several reasons. Most fans are mainstream fans. They care about personality and interview style. They then watch the fights because they either like the guy a lot and want to see him win, or hate him and want to see him lose. If they're indifferent, he's not over.
The other reason is he just doesn't look like a fighter is supposed to look. He doesn't look like a full gown intimidating man. Think of these fighters- Dan Henderson, Wanderlei Silva, Vitor Belfort, Randy Couture, Chuck Liddell, Tito Otiz, Brock Lesnar, Cain Velasquez, JDS, and DHC. Which one doesn't fit?
The other reason is he just doesn't look like a fighter is supposed to look. He doesn't look like a full gown intimidating man. Think of these fighters- Dan Henderson, Wanderlei Silva, Vitor Belfort, Randy Couture, Chuck Liddell, Tito Otiz, Brock Lesnar, Cain Velasquez, JDS, and DHC. Which one doesn't fit?