Kudos to your Gohan avatar, he's the sugoi.
That's likely because Beto said a lot of great things that the left and liberals wanted to hear, apart from his support of Israel. Too many people he represented hope and change, especially in Texas. On top of that, Cruz is seen as a horrible person, and his zodiac killer joke did not help with his image. The traction Beto gained, and how close the election was, were what generated such strong emotions among people.
If Cruz wasn't a piece of shit sleazebag that no one on either side should have voted for, or if Beto wasn't such a left-winger, then the reactions wouldn't have been so strong.