The Lubavitcher Rebbe, Rabbi Menachem Mendel Schneerson, was opposed to Jewish lads attending college in the 1950s - despite the fact he attended two universities himself (the University of Berlin and the University of Paris).
In the 1950s, a nineteen-year-old student at the Lubavitch yeshiva came for a yechidus to discuss his intention of going to college. More than three decades later, the then middle-aged man related to Rabbi Simon Jacobson the story of the encounter he had that day with the Rebbe.
"I told the Rebbe that the reason I wanted to go to college was because I felt I had done my studies in Torah and I wanted to expand my horizons." He explained that he intended to remain a Chasid but hoped a secular education and college degree would help prepare him for a future livelihood.
After the student concluded his presentation, the Rebbe responded, "Are you asking for an eitzah [advice] or for a bracha [blessing]? The young man, perhaps sensing the response that was coming answered, "I came in for a blessing."
"A blessing with advice is always better than one without advice." The Rebbe than proceeded to tell him, "In my opinion, you shouldn't go. You should continue your studies in yeshiva. You will be matzliach [successful] and you can be a leader in the Jewish community with that."
For the young man, the stakes were sufficiently high and he found it impossible simply to accept the Rebbe's veto of his plan. "How can the Rebbe tell me that when the Rebbe himself went to college?"
"Precisely because I went to university, I know what it's about. I know the environment, and I think it will have a detrimental effect on you instead of a positive one." Seeing that the young man was still unconvinced, the Rebbe tried another track. "Can you draw a circle?" he asked.
"Yes," the young man answered, presumably perplexed by the question.
"Can you draw a perfect circle?"
"No, I can't, not on my own."
"What would you need to draw a perfect circle?" the Rebbe pressed.
The Rebbe, whose interest in and aptitude for mathematics was well known, continued. "Tell me the difference between the circle you would draw on your own and the circle you would draw with a compass."
"The circle I draw on my own won't have a sturdy center around which to draw borders, but the compass's center creates a perfect circle."
The Rebbe then elaborated: "All knowledge you'll ever learn, every experience you'll have in your life, are the circles. They're not the center. If you don't have a solid center, you'll have jagged circles, incomplete circles, many different circles. I sense that you need that center before you start building your circles."
When the man, then in his early fifties, related this story, he added, "I didn't listen. I went anyway." He started to cry softly. "And I still don't have a complete circle. I have many circles, this one, that once, incomplete."
"Just because one person goes into a fire and comes out unhurt, doesn't mean that everybody should go into the fire."
Telushkin, Joseph. Rebbe: The Life and Teachings of Menachem M. Schneerson, the Most Influential Rabbi in Modern History. Harper Wave, 2014. Pages 328-329.
Obviously, from the above quotation, we see that the Lubavitcher Rebbe's opinion that Jewish lads should not attend college does not stand within the parameters of halacha, but is rather an opinion of his (because he believed "college-aged" youths were not firm enough in their faith and understand to be able to tackle the concepts and teachings that are taught in universities).
Hope this answers your question.