I'm a little bit shocked to see people defending Ulfric's blatant racism.
That's because no one is defending it. They're disputing whether it exists or is blatant. What comes out of Ulfric's own mouth that labels him a racist?
Also, you're conflating nativism with racism, and there IS a difference. Go tell a native American about how they feel about European settlement of their land, then call him a racist to his face. Let me know how that goes. And even if Ulfric WAS a racist, (which he is not), he's in a world full of other racists. The various elves are all convinced of their own superiority, and everyone pisses on the Khajiit and Argonians, so holding Nords to a different standard isn't exactly fair to begin with. So taking Nords to task for wanting their homeland to themselves is a lot more like calling the Scots bigots for wanting to repel Edward I of England than it is calling James Monroe a bigot for encouraging the founding of Liberia.
Look, nobody is claiming that Ulfric Stormcloak is the reincarnation of Abraham Lincoln (who wasn't exactly politically correct himself, when you look at some of his statements). The people arguing on Ulfric's behalf are merely pointing out that a King defends his people, or he's no King at all.
Betray? Betray how?! Titus made Peace with the thalmor so his subjects would survive, That battle of red ring was a major victory, and guess who planned the attack...Titus Mede II, Who lead the attack? Titus Mede II. Without Titus Man kind would have fallen!!!!!
He's the Emperor. Leading his people in war is no more than his duty. And just as important as winning the battles is negotiating a just peace. So when it came to bargain with the Thalmor after the Battle of the Red Ring, Titus Mede II had a choice: Accept an ultimatum that would shiver his realm into pieces, or continue fighting. Well, he chose the former, and the Skyrim and Hammerfell revolts are the direct result. You don't get to screw your subjects then act shocked when they're not interested in obeying your rule anymore.