This is interesting. I didn't realise so many people disable it. A lot of what you're saying is completely backwards to my life experience.

For me and I guess most people I communicate with on e.g. Whatsapp. "Call me." is normal, expected, everything is fine, just need a phone call. "call me" is more like something has gone so horribly wrong (or someone is so incredibly pissed off) they've lost the ability to communicate normally. I wouldn't be offended, more like concerned.