Pretty self explanatory, which of these commonly shipped stallions do you like the least? Explain why in the comments, if you could. Spike isn't an option because he's not a pony, and Discord's a genuinely good character.
For me, it's a toss up between Soarin and Flash. Not because "they stole my waifu" but because they don't really have any real characterization other than being nice jocks. Soarin's a bit clumsy and a big eater, but he really doesn't have much character beyond that. You could argue they haven't been in enough episodes, but Soarin's been in at least 4 and Flash has been in two movies. There's no excuse for them not to have at least somewhat compelling characterization. And yeah, I admit, Soarin stole my waifu.