I replied that
“The Mass was full of the scriptures from the opening prayer to the final blessing and what did they think the First Reading, Psalm, Second Reading and Gospel were - they’re Scriptures” …
They replied - ***“That’s not the Bible - that’s the Missal” ***…
I am flabbergasted

and embarrassed for them
Truth is … as a non Catholic - I heard many sermons - some focused on Scriptures - mostly those ‘favorite’ passages of the pastor - especially at the “Bible” churches … they are not required to address the entire bible - the local pastor gets to select what passages they want to preach on … you only hear a passage quoted in the sermon - most do not have scripture readings proclaimed [though some of the liturgical mainline churches do]. The pastors of the mainline liturgical churches can follow the Cycle of Readings - but they are able to change them if they desire and focus instead on another topic …
Also - there is a difference in a “Sermon” and a “Homily” in my experience with Sermons in my non-Catholic churches and the Homily since I became a Catholic. I would explain the differences this way.
A sermon uses scriptural passages to explain and or support an idea – for example if you want to focus on the “end of times” – you would talk about the state of the world today and how we are spiraling towards the advent of the Anti-Christ and then select the passages to support that idea. Or if a pastor wants to focus on a particular sin [adultery or drunkenness] he preaches on how sinful that is – and quotes passages in support … it uses Scriptures a the witness of the message.
The homily is a commentary on some part of Scripture Readings of the day. The purpose is to explain the literal meaning and develop the spiritual meaning in order to provide a context and or a reflection on the scripture reading that is designed to make the passages relevant/pertinent to our life today. Basically, the homily uses the message or meaning of the passage from the time it was written and attempts to contextualize it for the modern hearer.
Also as other posters have noted - non Catholic Services are more related to Bible Study in focus - not worship … The Mass is focused on worship of Christ.