We are deeply sorry that you have suffered this experience.
In order for Airtripp staff to check and deal with these types of malicious content, please tap on the upper-right menu (three vertical points) inside of a photo or in the offending user profile and select "Report". Alternatively, you can also block the user. If you block a user, he/she will not be able to comment or message you anymore.
In order to block a user, tap on the upper-right menu inside the offending user profile and select "Block".