Colossians warns against anyone disqualifying believers by insisting on asceticism and worship of angels Colossians 2:18. It contrasts this with "holding fast to the Head," from whom the body grows Colossians 2:19.
In Colossians 2:16–19 Paul tells the Colossians not to let anyone sit in judgment over them based on food and drink rules or calendar observances. He frames such practices as only a preview compared to what belongs to Christ. This section continues Paul’s push in chapter 2 against pressures that present extra rules or spiritual techniques as necessary. Just before this, he argues that believers are already “filled” in Christ and should not be captured by merely human tradition and spiritual speculation (Colossians 2:8, Colossians 2:9–10).
Paul is dealing with outsiders (or influential voices) who try to define the Colossians’ standing by adding measures beyond Christ. Explicitly, he says they must not be “judged” on food/drink and calendar observances (festival, new moon, Sabbath).
A careful answer keeps the immediate passage, the book's argument, and the whole-Bible storyline together, so the question is answered in context instead of as a detached idea.
Start with Colossians 2:18, then read the surrounding section so the answer stays connected to the passage's flow.
18Let no man rob you of your prize by a voluntary humility and worshipping of the angels, dwelling in the things which he has not seen, vainly puffed up by his fleshly mind,