You can hide any token in your portfolio moving it to a spam section. They seem to have implemented a spam filter of some sort in the past few weeks as well. A few of the scam tokens I received went directly to my spam folder instead of clogging my portfolio. If you really want to get rid of them the ability to burn tokens in your possession was added with this update. There is a small fee (.001 Waves IIRC) so I just left them all in the spam folder, but the option is there if you want it.