In our FET family, we do not entertain offensive members, so here are a couple of actions you can take.
First, we recommend that you block the offending person and put them on your block list, which prevents them from writing to you again or viewing your profile. However, you can only put someone in your block list who you've had previous contact.
Second, if the offence is particularly nasty and goes against our Community Guidelines, report them to the Support Team - we'll take it from there. To report a member to us, visit their profile, at the top right of the screen, tap the three dots and select 'Report User'. You can also block the user from the same options list.