Before you try to tell someone to get over it, you need to know what it's actually like. And then you need to not tell them to get over it.
TRIGGER WARNING: At 3:17, a woman describes an assault on a subway. You really should hear what she says so you can learn how horrific this is for many women on a daily basis.[youtube //www.youtube.com/embed/QYAL21jxREQ?rel=0&end=373 expand=1]
There are lots of ways you can help make people more aware of stories like theirs. You can get the Hollaback app and share your stories. You can Like Stop Street Harassment on Facebook. And you could share this and make sure more people know the truth. Totally up to you.
UPDATE: An area that this video fails to discuss at all is the much more difficult time Black and Latina women have when facing street harassment. Sadly, their voice is absent from this presentation of the issue, and as a result, some of the suggestions given (including that women yell back at men) don't reflect the experiences and insight of a lot of people who are fighting this type of harassment every day. There's a much safer way to help when you see someone being harassed. You should learn about it.