What just happened here? Am I the AH?

Had a customer pull up. I greet, they say they are looking for another store. I let them know how to get there and ask if there was a particular model or one i could help direct and if they may be interested in preowned. He might, he is walking around and seeing if anything else jumps out. Offer to go inside to see the entire inventory that fits his desires. Declines. Fine.

“We have our sedans here, new 3rd rows here….”

Ill ask a question hes got some kinda charged answer like they are sorta arguing. This happens a few times. The following is where customer blew up:

“Yes sir and i dont mean to feel we are arguing, im only asking so i can help you see the vehicles important to you”

He got triggered at the word argue. Started getting in my face saying no one is arguing because hed have to have an attitude first and he doesnt. Tells me hes a man and that hes 80yrs old blah blah.

I say “I want to make sure you get the best experience possible let me get you another salesman”

Customer: i dont need no fucking salesman. Told you im looking!

Me : yes sir i understand I just want you to be able to know which ones fit you. If you would now like to look without a salesman ill just let you be. Im sorry if its come off as anything deeper.

I try to walk away and he follows running his mouth, i still try to avoid a big blow up. I use my hands to say “Hey man dont shoot” motion that i have no issues and that im willing to let him do whatever he wants. He gets upset at that and says now im being aggressive. I try to tell him im trying to exit so he can look in peace, apologize, and that I only intended to help and obviously made a mistake somewhere. I try to shake his hand he slaps it away and says “ i aint shaking your damn hand”

At this point i just turned and walked inside and he didnt follow me and just left this time. Explain to manager and basically though no one saw it, i mustve had shitty body language because “everyone knows you hate when people dont buy” which i felt was never a case in this at all so trying to see if i am just a moron that cant ever do anything right or if im in the right here?