Why are people using the excuse that English isn't their first language? Also, why are they saying ignorant things like "Let's see you try to speak grammatically in another language?"
Chinese isn't my first language, and I'm still learning, but does that mean I completely ignore its grammar? Absolutely not. This is not a competition, though.
If you don't care about grammar and spelling, all power to you. But you don't need to waste your time in here trying to justify it.