then why me tagged as spammer with red highlight?
but this action should not tag them throughout their bitcointalk life with spammer with negative trust in red color because there is no such attempted spamming.
You also seem to think that "red tag" == spammer. While this
can happen on occasion... most spammers are dealt with via the "Report to moderator" link on messages which will eventually see the spammer banned if they continue.
You got a "red tag" for merit begging via PM... it even says so in the Trust comment left by OgNasty:
OgNasty 2018-07-12 0.00000000 Begging for merit in unsolicited PM.
I don't see how anyone can think this is for "spamming".