I feel for both sides of this argument. Trvializing something traumatizing that people feel strongly about is not good, but I'm not sure using it in this context is exactly trivializing. The commenter could have said "banks still kill us with fees us six ways from Sunday" and most people would not say they were trivializing murder. Also, I'm not sure when sexual assault became worse than murder, but at some point in the past it did. You can't use rape/sexual assault as hyperbole in many places where you could easily use kill/murder etc. Maybe that's because there are survivors to read/hear the communication and be affected by it (although there are plenty of people affected by loss of a loved one through murder). In any case, I think this disproportionate response with regard to talking about sexual assault when compared to talking about items of a similar or worse level, such as murder, leads to people being confused by what appears to be inconsistent responses on crimes of this caliber.

So, with all that said, I don't think it's all that hard to understand why some people don't understand the problem of using "rape" as slang to mean "taken advantage of" or "coerced" when "murder", "kill", and "dead" are often used with no problem to mean "mad at", "should expect a rough time" or "be careful". Unless you are willing to either additionally condemn all uses of that type of speech, or define why it's very different, reducing the use of "rape" as used here to "trivializing sexual assault" is both inconsistent and unfair.

Continue to trivialize it more by using it to beat everyone around [including randoms on the internet] with your smugness.