I don't think I have a BREED I actually hate, as a whole... But there are breeds who tend to have traits I have zero use for and as a result would be almost totally unlikely to own one.
There are also breeds who tend to carry traits that mean I wouldn't suggest them, as a whole, to someone else as a potential breed option. For example, I would be highly unlikely to recommend someone who was just starting with horses LOOK FOR a TB or WB for their first horse... If one came along that suited them I wouldn't rule it out on breed alone, but they just aren't breeds who come immediately to mind when I think "first horse".
As a Saddlebred owner, I do understand the breed bias frustration but, on the whole, I'd say that a nice horse, regardless of breed, will get the recognition it deserves. One of my Saddlebred mares certainly got comments like "well, you can expect her to not do any better, she is a Saddlebred" or "she did well, for a Saddlebred"... But those were on days that just weren't going as well for us (we all have those, no matter what breed we ride), on the days where things were spot on - she won (even with the very same judges who had left her at the bottom of the class a few weeks before). Sometimes what appears to be breed bias is actually just a reflection of how that day is going. (And sometimes, sadly it is real)
As someone who loves Saddlebreds, especially that one mare, it can feel frustrating when other people didn't just immediately see her for the gem I see her as - but, I have enough experience to know that some days, she really doesn't share those qualities quite as obviously either
On our "we got this!" kind of day we have made some converts of people who previously hated the breed based on misconceptions. (And if I can entice someone to ride one... Then they forget they ever hated them at all