I was studying in the US 2 years ago and during the summer break I went to India to visit my gf who is studying there. During re-entry to the US, I was detained

I was studying in the US 2 years ago and during the summer break I went to India to visit my gf who is studying there. During re-entry to the US, I was detained/interrogated for couple of hours. I believe it is probably due to I am a Muslim and I have Indian immigration stamp in my passport. I even have my I-20 endorsed prior to travelling. Even with I-20 proof, I had to convince the officer that I came to the US for education. I also have friends who are also Muslim, randomly searched/detained at the airport and all of them are students too. Besides that, I enjoyed my stay in the US. Just the immigration part is PITA.