| During our flight, there was a passenger that never wore a mask, not at any time on the flight. Repeatedly, the flight crew served this man 3 alcoholic beverages. They had ample opportunity to address the fact that he was not wearing a mask with him, and could have denied him the ability to purchase alcohol. Instead, they served him 3x. My issue is not with the serving of the alcohol, but rather that there was not a single person on the crew that stood up and made the man wear a mask, nor took any other measures about it. Passengers all around us were commenting on the fact that this passenger was not wearing a mask. No one felt safe. An older Air Force Veteran was seated directly in front of the passenger and asked that he put on a mask. The passenger said "What's your problem? You believe all this bullshit?" Furthermore, I witnessed the passenger go to the bathroom in the back of the plane 3x where the other flight crew was sitting in unoccupied seats. They didn't say a thing to him. They laughed with him when he passed as he took his long beard and covered his face (laughing) and they joined in the fun. Are you kidding me? You openly laugh with a passenger without a mask on and watch him go to the bathroom 3x and do absolutely nothing. We were travelling with my children, one of which is too young to wear a mask at only 16 months old. How is it okay, how is it safe for us to fly? They promised us as a company that their standard was to require masks to be worn. No exceptions. Yet they don't. After the flight, as we were disembarking, I said to one of the flight crew, "How could you be so complicit as to let that man not wear a mask the entire flight?" to which her response was "He had one on and would take it off. What could I do about it?". He did not have one on. Not at any point. Not when he went to the bathroom, not when he sat in his seat, not when he stood up before the plane was even done taxing (not once, not twice, but three times), nothing. How does your Flight Crew have NO answer to a passenger that won't put on a mask? Delta is openly banning passengers like this from ever flying again and, on record, has landed planes in flight to address people like this to show a firm hand, severe consequences. Spirit's team does nothing. They sit in the back of the plane and laugh with him. We will never fly Spirit again. They made our family feel unsafe. They made other passengers feel unsafe.