Personally I wouldn't care, as long as it tasted good to me.
I can understand why some people are unhappy though if they have been sold beef products and got horse, and they have an issue with eating horse meat. (even though I suspect 95% of these issues or more based on not liking the idea of it rather than the flavour )
Sure if it had been bred for that purposes and tasted nice... would I eat someones personal pet? No, that seems unnecessary.I don't like the idea of eating horses. There are some animals we generally do not eat, usually because we consider them as companions.
Horses are treated more like friends than food, that's why alot of people are adversed to it. I think of them like cats or dogs.
Would you happily eat dog?