只要他今天那个形相是个沙门，对于这个形相不可以骂、不可以毁，这点要注意。

菩提道次第广论：

『若于僧伽，或出 家众，持沙门相及于其相不骂不毁，又一切种不应分党，视如怨敌，云汝等我等，应当敬重犹如僧宝。』

As long as he displays the symbol of the Shramana (monk), then with this symbol, you cannot revile or despise. Make a note of this point.⁠⁠⁠⁠

From Lamrim:

The third prescriptive precept is never to revile or despise members of the community, renunciates, or those who merely possess the symbols of a practitioner of virtue [someone who is dressed as a monk or nun but has no vow]. Nor should you do this to the mere symbols [part of the robes] of these practitioners. Never in any way divide yourself and others into opposing factions and view the others as enemies. Always treat members of the community with respect, as though they were the community jewel itself.