Funny, I am presently in a similar conflct with someone over the use of a certain term. The "someone" has never claimed trademark, has never filed for trademark but is now bitching and whining because I am using the term.
"Someone" hasn't got a leg to stand on. The term is ubiquitous, in that any number of people are using it and also a geographic name and can only be trademarked, if at all, when combined with other words or marks.
The single-word term itself cannot be trademarked.
I have told "Someone" to go pound sand in their ass.
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