I'm taking the opportunity of this huge influx of new users to let them know we have a report function! I'm not sure it's integrated in the mobile apps yet, but it works great on the website.
To access it, click on the ... (three dots) menu below someone's comment, then click on the waving flag icon:
We have tons of applications coming in at all times, and some trolls will probably make it through the cracks. If you see something, report it!