malcourteous 

disrespectful; unkind; not courteous.

1. "As motorcycle riders, we have to pay attention out there. There are many disattentive and malcourteous drivers who make the street a dangerous place to be."

2. Mr. Style isn't nice to Dorothy, he's being malcourteous.

malcourteous by YAHBO February 11, 2013

miscourteous 

showing rudeness and a lack of consideration for other people

It would be miscourteous to disapprove my claim.

miscourteous by Block28 March 15, 2022