Plenty Of Records To Choose, What Type Of JOIN?

I have 100k + records in table usr_table and I want to select all of them that do not have the same ID as the ID's indicated in table Usr_Type_Data

Select * From usr_table As t1
Join Company_Sales.dbo.Usr_Type_Data As t2 ON
t2.user_id = t1.user_id Where CustomerTypeId <> 7

I get 0 returned.

If I change it to:

Select * From usr_table As t1
Join Company_Sales.dbo.Usr_Type_Data As t2 ON
t2.user_id = t1.user_id Where CustomerTypeId = 7

I get all records from table Usr_Data_Type returned.

Do I need to specify a special Join type?

Or perhaps change the T-SQL around?