I'm sure overall everyone could be watchful as to if someone else is being left out when they are talking in a group period. But that aside, I wonder how satisfied you are with being single? I'm wondering if you were happy & content being single I doubt you would anyone else's conversation about their relationship even register a blip? -- possibly some boredom but not resentment, anger or bitterness. So perhaps you might want to reconsider your choices and look at your options? Maybe you are feeling a little lonely? there are ways to open to relationships with people that could include a spouse or even just cultivating more supportive , nourishing emotional relationships.
Also, I think that sermon about weighing our words & other sermons are for applying to ourselves -- not how we can show others the many ways that they are annoying or wrong and how it is just so personally offensive to us? I don't allow myself any time to axe grind about others. When I'm feeling emotional pain or upset I express it and let go of it, if something is really bothering me - I take it to the Lord.