Dear redditors, this is my first post here, so please forgive me for any mistake and breaking the rules/codex in the forum. A novice redditor here. 

The incident occurred last Saturday (9th February) and has left me (M33-South East Asian) mind boggled. 
So with 2 other female friends of mine (let's call them F36 (European blond) and F42(European brunette) ) we have arrived at the event location, where we are helping as volunteers to provide food and snacks for some artists. F42 has parked the car and waits in the car and we (F36 and myself) have to carry 4 cartons/boxes from the front door to the back stage (50meters walking distance ). 
I got 2 boxes immediately on top of each other (20kgs) and deliver it happily smiling without paying attention to the F40 (European Blond) sitting at the front door as cashier/ticket counter to back stage. Now, on my way back to do the second round I see my F36 friend carrying ome carton and I happily opened the doors for her to get through. 

While I held the door open for my friend F36 to pass through, this F40 sitting at cashier/Ticket counter looks at me and says in a very judging tone ``Hey Man, You let a lady carry stuff instead of helping ''? 
To which my response in a funny/chilled way is
'' We live in a world of equality and equal rights. And this is Berlin, so I don't see a problem here''. 

The F40 responds '' Holy Shit!! What kind of Man are you to let her carry stuff ? '' 

I try to swallow her comment down, remaining calm in my tone. I replied '' There are no differences between Man and Woman for doing work and besides that haven't you paid attention when I carried two boxes on the top of each other  in the first trip? '' 
To which F40 responds '' SHIIIIIT Maaaan, such an ASSS'' and she breaks eye contact with me, somehow ending conversation and looks away back to the book in her hands, continues to read. 

Meanwhile, F36 returns from inside and hasn't realised what has happened within these 2 minutes. F36 calls me back in and I leave without responding anything to this F40 who judged me out of nowhere. 

Am I The Asshole here? 
In case, I have missed some details please ask away for further information. I thank you redditors in advance. 

PS:I have mentioned ethnicity with age (F/M/European/South East Asian) as I believe this also played a role over here somehow. 