You three are not alone. I suspect we are normally too charitable to point out how inappropriate it is, as that is usually taken as a criticism of the performer. It’s not; it’s criticism of the applause. This Catholic cringes when he hears it, and offers the praise to our Lord.
This presbyterian cringes as well and has to actively resettle her mind on things above.
I think it is the crass culture of the day. At my daughter’s wedding, prior to the start, the pastor requested that, in view of the church’s view that this is a worship service and applause is distracting, for people to hold their celebrations until after the service and for the reception. Some applauded anyway.