Do you think this is fair?

I am so frustrated and mad right now because my step dad grounded me 2 days ago because i talked back to him and said a cuss word and he took away my makeup and computer because of that. I was just like mad about it so when my mom just got done cleaning the table I put my bare feet on there and i said hey mom how clean is your table now and I was laughing and wiggling my toes hoping she wouldn't get too mad because I wanted to make my parents mad because they punished me but I just wanted to make her a little mad but not enough to punish me even more. She walked over to me pulled me out of the chair and walked me over to my step dad and told him what I did and he said go to your room. He came in there like a few minutes later and said that I was grounded for a week for my behavior. I am not allowed to step one foot out of the house until next Friday not this upcoming Friday but next friday. I am really upset right now because I see my friends outside and I am really itching to go outside but my step dad said no. I want to have fun and I want my freedom back I feel like I am locked in jail all because I put my barefeet on the table I mean who really cares it's not a big deal. I want to go outside!!! Do you think this Is fair? Would you ground you kid because of what I did?