I met this guy on an online dating site, but I did not like how he talked to me. I feel that he is real guru scammers online for bad things.

Did he ask for money?

If you have a bad feeling about him, then ignore him and don't keep talking.

Stick with people you can have coffee with in person... at least you can be sure they are real.

If you have a bad feeling, stop talking, same as you would, if you meet him at the local store, and had a bad feeling.