Is it permissible for a State District Court to deny a pro-se plaintiff every motion to amend, to never allow an amendment to a meritorious case, to dismiss his case on 12(b)(6) failure to state a case upon which relief may be granted, citing a lack of particularity, to never once afford the plaintiff the opportunity to provide a more definite statement?

Is it permissible for a State District Court to deny a pro-se plaintiff every motion to amend,to never allow an amendment to a meritorious case,to dismiss his case on 12(b)(4) failure to state a case upon which relief may be granted,citing a lack of particularity,to never once afford the plaintiff the opportunity to provide a more definite statement?