is this rude?
Is it rude not to use "です" after a noun?
For example, "これは私の部屋。" instead of これは私の部屋です。
Is it okay to say this to strangers?

thanks in advance

Question

is this rude?
Is it rude not to use "です" after a noun? 
For example, "これは私の部屋。" instead of これは私の部屋です。
Is it okay to say this to strangers?

thanks in advance

Answer

Actually , sometimes people lose ”です・ます” momentarily.
 But it's not rude, if you use "です・ます"　basically.  
 Behavior affects  to impressions more than words as you know .