Why should everybody be compelled to spell exactly alike? The fact is, that lots of people spell words differently, and I’m not sure that makes what they write all that more difficult to read. I can spot a spelling “deviation” from a long way off, but that doesn’t mean I don’t know what’s meant.
You’re not compelled to use standardised spellings, as virtually any page of the internet open for comments will demonstrate. But if you take that attitude towards spelling, you should be aware that many people will be irritated by it, and many will consider what you say not worthy of notice, even if the content makes perfect sense. There is no intrinsic reason why you shouldn’t go out on the street wearing pyjamas and dressing gown, but most people don’t, for similar reasons.