The subjunctive mood is not used in the same way in French and English. While it is required for this sentence in French, you would use the indicative mood in English "Do you think that is disturbing?". It would be incorrect to write "Do you think that were disturbing?"
'Do you think that were disturbing?' doesn't sound so much subjunctive as rather a mismatched number agreement for '...those were...'. I think the actual English subjunctive would be 'Do you think that this be disturbing?', which is now long since obsolete of course.