What evidence? This stupid article on this particular incident?
You have no idea what you're talking about.
It's a matter of record. A couple of examples from the article:
"UT previously had refused to admit black students after World War II, resulting in a 1946 lawsuit by Heman Sweatt, who was represented by future Supreme Court Justice Thurgood Marshall....
UT's supporters in the Legislature, in order to provide a separate-but-equal legal defense for segregation, passed a bill creating what would become Texas Southern University in Houston."
It's no use pretending that such racial discrimination (and worse) did not take place in Texas and elsewhere. It really did. And Mr. Simkins appears to be a poster child for just how far some folks were willing to go.