<p>Like Blueiguana says- how much of this rivalry do you want to bring into the relationship with your son. Which is more important? (I am being facetious here) and do you really want to set up a lifetime of college rivalry between the two of you. You went to college years ago. That’s over. Your son is now and your future. From this point on, your son’s school is the greatest school on the planet as far as you’re concerned ( and if he has siblings, their schools are too). </p>
<p>How you view your son’s school- what you say and how you behave, will make a big difference in your relationship with your son. If you persist in adding an explanation or disclaimer when you talk about it, he will feel you do not approve of him. Next time say “my son is studying X at college Y and we are thrilled”</p>
<p>I would take your old college T shirt, stuff it in a drawer, and not wear it again… and if you have any other children who attend your alma matter, I would refrain from wearing either school T shirt, unless you want one of your kids to feel excluded.</p>