Anyhow I want to know that if we delete our posts ourselves, does it have a bad effect on our account and can we still get tagged or something or it is completely normal ?
It's completely normal. There are no reason to tag someone for that however we have some over enthusiastic forum members who will write a note something like "Be aware..." but I think most of us already learned how to ignore this group and their leader.
Totally get what you're saying. There's this forum member who's tagging users suspected of posting low-quality stuff. I've seen quite a few accounts get tagged, but it's usually just a neutral feedback. I'm not sure if there have been updates to this tagging system, but let's be real, nobody's a spammer all the time, right? Some people might try to step up their game and improve their posts. Tagging does kind of work as a warning, but personally, I'm not convinced it's all that necessary.
Now, in response to the OP's question, I can see how you value your account, but I'd say no, it won't mess with your account because it's not reported.